4．The sun _____ we get heat and light is the most important source of energy．（　　）
A．whichB．thatC．from whichD．from it

分析 我們能從中得到光和熱的太陽是最重要的能源來源．

解答 答案：C 考查限制性定語從句．在get sth．from…中，from表示來源，排除A、B項，缺少介詞；D項中缺少連詞，也應(yīng)排除．故選D，which引導(dǎo)限制性定語從句．

點評 引導(dǎo)定語從句的關(guān)系代詞有who，whom，whose，which，that等和關(guān)系副詞where，when，why等．關(guān)系代詞和關(guān)系副詞在定語從句中擔(dān)任句子成分．在定語從句中，關(guān)系代詞或關(guān)系副詞都代替先行詞在從句中充當(dāng)一定的成分，如果該從句中缺少主語、表語、賓語或定語，就要用關(guān)系代詞來連接從句；如果從句中缺少狀語，就得用關(guān)系副詞來連接從句．

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